B.can C.have to
D.must 解析:表示推测,依据most probably,语气应为“应该”。 答案:A (2)need的用法:need作情态动词时。没有人称时态的变化,后接动词原形,多用于疑问句或否定句中;need也可用作行为动词,后接名词、代词或带to的不定式。 这样考过 (2007·长沙)Generally,reporters take positive lines.They do point out a few problems that we________aware of,but there's nothing worrying. A.need to
B.need C.need be
D.need to be 解析:need用作情态动词时,主要用于否定句,疑问句和条件从句中,后跟动词原形;need用作行为动词时,用于肯定、否定和疑问句,后跟名词、代词、动词不定式或动词ving形式(用ving主动形式表示被动意义)。此处是肯定句,故need用作行为动词,后跟动词不定式;be aware of“知道”,因此选D。 答案:D
(2010·淄博上学期期末)In fact, you ________ go outside at all. There’s a supermarket just downstairs. A.couldn't
B.mustn't C.needn't
D.shouldn't 答案:C (2007·江西九所)—I didn't go to work today. —You________;it is Sunday. A.didn't need to
B.mustn't have C.can't have
D.needn't have 解析:一般情况下,动词不定式可省略to后的成分,而动词不定式本身的标志词to不能省略。 答案:A 二、情态动词表示推测 1.情态动词用于对现在和过去的推测。 对现在的推测 对过去的推测 肯定 否定 肯定 否定 must do can't do must have+ved can't+have+ved could do couldn't do could have+ved couldn't have+ved may do may not do may have+ved may not have+ved might do might not do might+have+ved might+not have+ved should do shouldn't do should+have+ved should+not have+ved 注意:①在表示推测时,can不用于肯定句,may不用于疑问句。②should可用于表将来的推测。 这样考过 (成都检测)I can't find Mr.Li anywhere in the office building.Where ________ he have gone? A.must
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